How Google and Yahoo Treat the Attribute, of the No Follow Link
According to Google, Assuming that link is still no follow link per Wikipedia’s current practice the Google will not find a little less index in that page. And From Yahoo, the link is available to oar crawler’s for finding the target then it will be crawled and indexed based on our algorithms.
Though on a related note, the search engine marketing field hope and expect that more and more sites including Wikipedia will adopt a lesser absolute approach to no follow link, expiring no follow link not applying no follow link to trusted contributors, and so on.
The search engine find the site and index it even though the link uses a No Follow attribute if a site has no web citations.